Gear for automatic action of throttle and slide valves



2 Sheets-Sheet 1.

O. B. COOK. Gear forAutomati'o Action of Throttle and Slide Valve Patented Mar 23, I880.

- WITNESSES:

ATTORNEYS.

T N W m Q$MO N-PETERS QuOw-umoemrugn. WASHKNGYON 0 c.

2 Sheets-Sheet;

I O. COOK. Gear for Automatic Action of Throttle and Slide Valve.

No. 225,799. Patented Mar .23, 1880.

a 1| 5; 1 T I a .1 LI j O [E O 2 A A MY .7 h I] l 6 9 I J A y '1 If v WITNESSES: 0

ATTORNEYS.

N PETERS PHOTGUTNOGRAPHER, WASHINGTON, 0 C

o UNITED STATES PATENT OFFICE.

CYRUS B. COOK, OF OYNTHIANA, KENTUCKY.

GEAR FOR AUTOMATIC ACTION OF THROTTLE AND SLIDE VALVES.

SPECIFICATION forming part of Letters Patent No. 225,799, dated March 23, 1880.

Application filed September 4, 1879.

To all whom it may concern Be it known that I, CYRUS B. GooK, of

' (Jynthiana, in the county of Harrison and State of Kentucky, have invented a new and Improved Gear for Automatic Action of Throttle and Slide Valves; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a side elevation; Fig. 2, an end view with the disks in section; Fig. 3, a plan view with a portion of the governor-frame removed, and showing in section the tension devices for connecting the throttle-valve with its actuating mechanism. Fig. 4 is a perspective detail of the three disks, showing the action of the dogs or pawls on the same.

In the ordinary connection between the governor and its valve, the sliding action and free movement of the said governor-valve necessary to allow it to he sensitively acted upon by the governor permits such a leakage of steam as prevents the positive and reliable eflect of the governor.

In the patent granted me August 12, 1879, No. 218,492, I provided certain peculiar devices whereby the governor was made to antomatically cut oil the steam, in proportion to the requirements of the work, by regulating the length of the stroke of the slide-valve.

My present invention consists in combining with the ordinary screw-stem throttle-valve a part of the sames devices which I employed in my patent referred to, whereby the engine is made to act upon its throttle-valve to positively open or close the same, according to the requirement of the work.

The improvement also consists in means for preventing damage to the throttle-valve or other working parts from the momentum of the engine when said throttle-valve is screwed to its utmost limit in opening or closing, and also, further, in the peculiar arrangement of the gear for simultaneously acting upon the cut-off and the throttle-valve, as hereinafter fully described.

In the drawings I have shown my present invention arranged in connection with the slidevalve out-01f which forms the subject-matter of my said previous patent; but as my invention is designed to be used by itself as well, I will first describe it without reference to the slide-valve cut-oh, and after which its conjoint action with the same will be explained.

A is the steam-cylinder; B, the slide-valve box; 0, the rock-shaft journaled in a framework; D, a pitman connecting the slide-valve rod with the oscillating arm of the rock-shaft; E, the piston-rod; F, the main pitman; Gr,main drivel-shaft, and H eccentric-rod connecting main drive-shaft with the rock-shaft.

In using the main feature of my present i11- vention the rock-shaft 0 need not be of the compound character here shown and covered in my previous patent, but may be a simple plain rock-shaft, and the outer notched disk I may be dispensed with. The device essential to the positive and automatic operation of the throttle-valve consists of a crank-arm, J, fixed rigidly to the rock-shaft and carrying two pivoted and pendent pawls or dogs, a b, which rest upon the peripheries of two disks, K L. Both these disks turn loosely on the extension of the rock-shaft or a sleeve encompassing the same, as hereinafter described. One of them, K, nearest the arm J, is notched uniformly throughout its periphery, and has upon its side a chain-wheel,K,fixed to the same, around which passes a chain-belt, M, which extends to a corresponding chain-pulley, N, on the screw-stem of the throttle-valve O. The other disk, L, is arranged parallel and side by side with K, and is connected by a pitman, c, with the rising-and-falling stem (1 of the governor. This latter disk has upon its periphery two depressions, e f, which, as the disk is oscillated by the fluctuations of the governor, are brought, one or the other, as the case may be, into range with one or the other of the dogs aand I). (See Fig. 4.) Thus,if a large amount of work is suddenly thrown on the engine, the governorballs fall with the diminished speed, and the disk L, in turning in the direction of the single arrow, (see Fig. 4,) brings its depression 0 into range of the dog a as it oscillates, while the other depression, f, is out of range of the oscillation of the dog I). The dog a then, in falling in the depression c, strikes the notches of the disk K, giving it a step-by-step motion, and through chain-wheel K and belt M opens the throttlevalve and admits the steam until the speed of the governoris sufficiently increased. On the other hand, if an amount of work is thrown off the engine, and the governor-stem rises, the depression a is thrown out of range of dog a, and depression fis brought into range of the reversely-acting dog I), and the latter, in its oscillation, drops in the depression f and turns the notched disk K in the opposite direction, as shown by the double arrows, which movement, through the chain -belt, unscrews the throttle-valve and admits more steam until a sufficient speed has been reached. When the equilibrium of power and work is restored the governor holds the depressions c and fat "an equal distance on each side and out of the range of the oscillating dogs, and the latter do not drop into the notches. By this movement it will be seen that the governor sets the en ginc to work its own throttle-valve, and the latter is positively and automatically adjusted by the power of the engine to exactly admit or cut off the proper amount of steam without the difficulty experienced from the leakage of governor-valves.

If through any mishap the throttle-valve should be screwed toiits utmost limit by the automatic action of the engine, it will be seen that when that limit is reached the momentum .of the moving parts of the engine would cause a breaking strain on the throttle-valve stem or some other one ofthe connecting parts; and to obviate this the chain-pulley N (see Fig. 3) is not keyed rigidly to the stem of the throttlevalve, but is loose on the stem, and operates the same through a tension or frictiondisk 1 against which the chain-pulley is forced by a convex spring, 9, and screw-nuts h. With this provision it will be seen that when the screwstem of the valve reaches its limit of movement, if the engine is still in motion from its momentum, the chain-pulley N simply swivels against the friction-disk without involving the breaking strain referred to. This arrangement also permits the throttle-valve to be independently adjusted by hand without disconnecting the automatic gear.

My invention, as so far described, is capable of and designed for independent use; and I therefore do not in any way limit it to its combination with the other features with which it may be used, and which I will now proceed to describe.

To secure the most economical use of steam I not only make the governor to automatically adjust the throttleyalve, but cause it at the same time to regulate the stroke of the slide valve to secure a variable cut-off action. In securing this result I employ the hollow rock-shaft O, carrying crank or guide arms i i, Fig. 2, in connection with the central shaft, having a pinion, j, engaging with a rack, l, which depends from a cross-head, m, sliding on the arms which cross -head connects with the pitman of the valve-rod, so that when the hollow rock-shaft and internal shaft are given a differential movement the pinion raises or lowers the cross-head and increases or decreases the crank-throw of the valve-rod to cut off sooner or later, all of which is fully described and claimed in my patent to which I have made reference.

The disks K and L, I in this case mount loosely upon a sleeve, Q, through which extends the inner shaft, 0', and upon the outer end of which sleeve is rigidly fixed a third disk, I.

The sleeve Q, is kept from turning on shaft 0 by a slot and spline, and the said central shaft, G, is made to be operated upon by the disk I by reason of said spline-connection, disks I and L turning together in one direction by reason of the friction secured by the concave disk 02 and nuts 0 0. This disk I has a portion of its periphery notched and a portion plain, and it is operated upon by stationary dogs p q, Figs. 1, 3, and 4, pivoted to the frame-work, as in my prior patent. These dogs are made wide enough to rest upon both the disks L and I, but operate upon I only when a depression, 0 orf, in L is beneath one of said dogs, as on the right-hand part of Fig. 4, at which time it catches the teeth of the disk I. Then at the forward movement the disk I and rock-shafts O and 0 move together by reason of their frictional connection, while in. the reverse movement one of the dogs 19 q, as shown in Fig. 4, holds the disk I, and, through its rigid sleeve-and-spline con nection with the shaft 0, gives a differential movement between the latter and the hollow rock-shaft G, that causes the adjustment of the crank-throw, as described. Thus, (see Fig. 4,) supposing the governor-balls to have fallen by the throwing on of work, depression 0 of disk L will be thrown in the range of oscillating dog a, and this will adjust the throttlevalve. By the same movement of disk L, also, the depression f will be thrown out of range of oscillating dog I), and beneath stationary dog g, which will allow the latter to fall upon the notched disk I, and through the central shaft, 0, adjust the crank-throw and cut-oft action of the slide-valve.

Having thus described my invention, what I claim as new is 1. The combination of two loose disks placed side by side, one of which is notched and connected with the throttle-valve stem for communicating motion thereto, and the other of which is connected to the rising-andfalling governor-stem, and is provided with two depressions, and a rock-shaft carrying an arm with two dogs or pawls moving on the peripheries of the two disks, and adapted when oscillated to enter one or the other of the depressions and actuate the notched disk in a forward or backward direction, as required, substantially as and for the purpose set forth.

2. A rotary throttle-valve stem carrying a rigid friction disk, in combination with a loose wheel or pulley clamped against said friction -disk for a tension, and connecting mechanism adjusted for action by the governor, and actuating the said Wheel and pulley by the direct power of the engine, as described.

3. The combined devices for the automatic 5 and simultaneous adjustment of the throttlevalve and out off valve, consisting of the three disks I K L, the compound shaft 0 0, provided with crank adjusting mechanism, and an arm, J, with oscillating dogs a and b,

the stationary dogs 1) and q, and mechanism 10 connecting with the throttle-valve, substantially as described.

The above specification of my invention signed by me this 21st day of August, 1879.

CYRUS B. COOK. Witnesses:

EDWD. W. BYRN, SOLON G. KEMoN. 

